docs: def pcklof(filename):
      """
      Load a binary PCK file for use by the readers.  Return the
      handle of the loaded file which is used by other PCK routines to
      refer to the file.
  
      http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/pcklof_c.html
  
      :param filename: Name of the file to be loaded.
      :type filename: str
      :return: Loaded file's handle.
      :rtype: int
      """
      filename = stypes.stringToCharP(filename)
      handle = ctypes.c_int()
      libspice.pcklof_c(filename, ctypes.byref(handle))
      return handle.value